Ethyl 3-bromoisonicotinate is primarily used as an intermediate in organic synthesis, particularly in the production of pharmaceuticals and agrochemicals. It serves as a key building block for the development of complex molecules, often in the synthesis of heterocyclic compounds. Its bromine atom makes it a versatile reagent for cross-coupling reactions, such as Suzuki or Heck reactions, which are essential in creating biologically active compounds. Additionally, it is employed in the preparation of pyridine derivatives, which are widely used in medicinal chemistry for drug discovery and development. Its ester group also allows for further functionalization, making it valuable in the design of novel chemical entities.